Added propertyNames validator to draft6

CHANGELOG.md

@@ -4,6 +4,8 @@ Please keep to the changelog format described on [keepachangelog.com](http://kee
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Added
+- Draft6 validator now supports `propertyNames` validation.
 
 ## [2.8.1] - 2018-10-14
 

lib/json-schema/attributes/propertynames.rb

@@ -0,0 +1,23 @@
+require 'json-schema/attribute'
+
+module JSON
+  class Schema
+    class PropertyNames < Attribute
+      def self.validate(current_schema, data, fragments, processor, validator, options = {})
+        return unless data.is_a?(Hash)
+
+        propnames = current_schema.schema['propertyNames']
+
+        if propnames.is_a?(Hash)
+          schema = JSON::Schema.new(propnames, current_schema.uri, validator)
+          data.each_key do |key|
+            schema.validate(key, fragments + [key], processor, options)
+          end
+        elsif propnames == false && data.any?
+          message = "The property '#{build_fragment(fragments)}' contains additional properties #{data.keys.inspect} outside of the schema when none are allowed"
+          validation_error(processor, message, fragments, current_schema, self, options[:record_errors])
+        end
+      end
+    end
+  end
+end

lib/json-schema/validators/draft6.rb

@@ -34,7 +34,8 @@ def initialize
           "additionalItems" => JSON::Schema::AdditionalItemsAttribute,
           "dependencies" => JSON::Schema::DependenciesV4Attribute,
           "extends" => JSON::Schema::ExtendsAttribute,
-          "$ref" => JSON::Schema::RefAttribute
+          "$ref" => JSON::Schema::RefAttribute,
+          "propertyNames" => JSON::Schema::PropertyNames
         }
         @default_formats = {
           'date-time' => DateTimeV4Format,

test/support/test_suite_ignored_tests.yml

@@ -83,7 +83,6 @@ draft6:
     - properties with boolean schema/only 'false' property present is invalid
     - properties with boolean schema/no property present is valid
     - properties with boolean schema/both properties present is invalid
-  propertyNames: :all
   ref:
     - ref overrides any sibling keywords/remote ref valid, maxItems ignored
     - ref overrides any sibling keywords/ref valid, maxItems ignored